Yulianti M, Subagyo S, Sujarwo S, Wahyudi A, Rubiyatno R, Suganda MA, et al. Article RETRACTED due to manipulation by the authors Modelo de aprendizaje cooperativo tipo STAD y modelo de aprendizaje convencional: estudio comparativo de los resultados del aprendizaje de las técnicas básicas de pase inferior en voleibol (STAD-type cooperative learning model and conventional learning model: a comparative study on the learning outcomes of basic volleyball lower passing techniques): Article RETRACTED due to manipulation by the authors. Retos [Internet]. 2024 Jun. 1 [cited 2025 Dec. 15];55:346-52. Available from: http://revistaretos.org/index.php/retos/article/view/103770